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Merge branch 'drm-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / scsi_transport_spi.c
1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <linux/sysfs.h>
28 #include <scsi/scsi.h>
29 #include "scsi_priv.h"
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_spi.h>
36
37 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */
38 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
39 * on" attributes */
40 #define SPI_HOST_ATTRS 1
41
42 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
43
44 #define DV_LOOPS 3
45 #define DV_TIMEOUT (10*HZ)
46 #define DV_RETRIES 3 /* should only need at most
47 * two cc/ua clears */
48
49 /* Private data accessors (keep these out of the header file) */
50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
52
53 struct spi_internal {
54 struct scsi_transport_template t;
55 struct spi_function_template *f;
56 };
57
58 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
59
60 static const int ppr_to_ps[] = {
61 /* The PPR values 0-6 are reserved, fill them in when
62 * the committee defines them */
63 -1, /* 0x00 */
64 -1, /* 0x01 */
65 -1, /* 0x02 */
66 -1, /* 0x03 */
67 -1, /* 0x04 */
68 -1, /* 0x05 */
69 -1, /* 0x06 */
70 3125, /* 0x07 */
71 6250, /* 0x08 */
72 12500, /* 0x09 */
73 25000, /* 0x0a */
74 30300, /* 0x0b */
75 50000, /* 0x0c */
76 };
77 /* The PPR values at which you calculate the period in ns by multiplying
78 * by 4 */
79 #define SPI_STATIC_PPR 0x0c
80
81 static int sprint_frac(char *dest, int value, int denom)
82 {
83 int frac = value % denom;
84 int result = sprintf(dest, "%d", value / denom);
85
86 if (frac == 0)
87 return result;
88 dest[result++] = '.';
89
90 do {
91 denom /= 10;
92 sprintf(dest + result, "%d", frac / denom);
93 result++;
94 frac %= denom;
95 } while (frac);
96
97 dest[result++] = '\0';
98 return result;
99 }
100
101 static int spi_execute(struct scsi_device *sdev, const void *cmd,
102 enum dma_data_direction dir,
103 void *buffer, unsigned bufflen,
104 struct scsi_sense_hdr *sshdr)
105 {
106 int i, result;
107 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
108
109 for(i = 0; i < DV_RETRIES; i++) {
110 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
111 sense, DV_TIMEOUT, /* retries */ 1,
112 REQ_FAILFAST);
113 if (result & DRIVER_SENSE) {
114 struct scsi_sense_hdr sshdr_tmp;
115 if (!sshdr)
116 sshdr = &sshdr_tmp;
117
118 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
119 sshdr)
120 && sshdr->sense_key == UNIT_ATTENTION)
121 continue;
122 }
123 break;
124 }
125 return result;
126 }
127
128 static struct {
129 enum spi_signal_type value;
130 char *name;
131 } signal_types[] = {
132 { SPI_SIGNAL_UNKNOWN, "unknown" },
133 { SPI_SIGNAL_SE, "SE" },
134 { SPI_SIGNAL_LVD, "LVD" },
135 { SPI_SIGNAL_HVD, "HVD" },
136 };
137
138 static inline const char *spi_signal_to_string(enum spi_signal_type type)
139 {
140 int i;
141
142 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
143 if (type == signal_types[i].value)
144 return signal_types[i].name;
145 }
146 return NULL;
147 }
148 static inline enum spi_signal_type spi_signal_to_value(const char *name)
149 {
150 int i, len;
151
152 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
153 len = strlen(signal_types[i].name);
154 if (strncmp(name, signal_types[i].name, len) == 0 &&
155 (name[len] == '\n' || name[len] == '\0'))
156 return signal_types[i].value;
157 }
158 return SPI_SIGNAL_UNKNOWN;
159 }
160
161 static int spi_host_setup(struct transport_container *tc, struct device *dev,
162 struct device *cdev)
163 {
164 struct Scsi_Host *shost = dev_to_shost(dev);
165
166 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
167
168 return 0;
169 }
170
171 static int spi_host_configure(struct transport_container *tc,
172 struct device *dev,
173 struct device *cdev);
174
175 static DECLARE_TRANSPORT_CLASS(spi_host_class,
176 "spi_host",
177 spi_host_setup,
178 NULL,
179 spi_host_configure);
180
181 static int spi_host_match(struct attribute_container *cont,
182 struct device *dev)
183 {
184 struct Scsi_Host *shost;
185
186 if (!scsi_is_host_device(dev))
187 return 0;
188
189 shost = dev_to_shost(dev);
190 if (!shost->transportt || shost->transportt->host_attrs.ac.class
191 != &spi_host_class.class)
192 return 0;
193
194 return &shost->transportt->host_attrs.ac == cont;
195 }
196
197 static int spi_target_configure(struct transport_container *tc,
198 struct device *dev,
199 struct device *cdev);
200
201 static int spi_device_configure(struct transport_container *tc,
202 struct device *dev,
203 struct device *cdev)
204 {
205 struct scsi_device *sdev = to_scsi_device(dev);
206 struct scsi_target *starget = sdev->sdev_target;
207
208 /* Populate the target capability fields with the values
209 * gleaned from the device inquiry */
210
211 spi_support_sync(starget) = scsi_device_sync(sdev);
212 spi_support_wide(starget) = scsi_device_wide(sdev);
213 spi_support_dt(starget) = scsi_device_dt(sdev);
214 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
215 spi_support_ius(starget) = scsi_device_ius(sdev);
216 spi_support_qas(starget) = scsi_device_qas(sdev);
217
218 return 0;
219 }
220
221 static int spi_setup_transport_attrs(struct transport_container *tc,
222 struct device *dev,
223 struct device *cdev)
224 {
225 struct scsi_target *starget = to_scsi_target(dev);
226
227 spi_period(starget) = -1; /* illegal value */
228 spi_min_period(starget) = 0;
229 spi_offset(starget) = 0; /* async */
230 spi_max_offset(starget) = 255;
231 spi_width(starget) = 0; /* narrow */
232 spi_max_width(starget) = 1;
233 spi_iu(starget) = 0; /* no IU */
234 spi_dt(starget) = 0; /* ST */
235 spi_qas(starget) = 0;
236 spi_wr_flow(starget) = 0;
237 spi_rd_strm(starget) = 0;
238 spi_rti(starget) = 0;
239 spi_pcomp_en(starget) = 0;
240 spi_hold_mcs(starget) = 0;
241 spi_dv_pending(starget) = 0;
242 spi_dv_in_progress(starget) = 0;
243 spi_initial_dv(starget) = 0;
244 mutex_init(&spi_dv_mutex(starget));
245
246 return 0;
247 }
248
249 #define spi_transport_show_simple(field, format_string) \
250 \
251 static ssize_t \
252 show_spi_transport_##field(struct device *dev, \
253 struct device_attribute *attr, char *buf) \
254 { \
255 struct scsi_target *starget = transport_class_to_starget(dev); \
256 struct spi_transport_attrs *tp; \
257 \
258 tp = (struct spi_transport_attrs *)&starget->starget_data; \
259 return snprintf(buf, 20, format_string, tp->field); \
260 }
261
262 #define spi_transport_store_simple(field, format_string) \
263 \
264 static ssize_t \
265 store_spi_transport_##field(struct device *dev, \
266 struct device_attribute *attr, \
267 const char *buf, size_t count) \
268 { \
269 int val; \
270 struct scsi_target *starget = transport_class_to_starget(dev); \
271 struct spi_transport_attrs *tp; \
272 \
273 tp = (struct spi_transport_attrs *)&starget->starget_data; \
274 val = simple_strtoul(buf, NULL, 0); \
275 tp->field = val; \
276 return count; \
277 }
278
279 #define spi_transport_show_function(field, format_string) \
280 \
281 static ssize_t \
282 show_spi_transport_##field(struct device *dev, \
283 struct device_attribute *attr, char *buf) \
284 { \
285 struct scsi_target *starget = transport_class_to_starget(dev); \
286 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
287 struct spi_transport_attrs *tp; \
288 struct spi_internal *i = to_spi_internal(shost->transportt); \
289 tp = (struct spi_transport_attrs *)&starget->starget_data; \
290 if (i->f->get_##field) \
291 i->f->get_##field(starget); \
292 return snprintf(buf, 20, format_string, tp->field); \
293 }
294
295 #define spi_transport_store_function(field, format_string) \
296 static ssize_t \
297 store_spi_transport_##field(struct device *dev, \
298 struct device_attribute *attr, \
299 const char *buf, size_t count) \
300 { \
301 int val; \
302 struct scsi_target *starget = transport_class_to_starget(dev); \
303 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
304 struct spi_internal *i = to_spi_internal(shost->transportt); \
305 \
306 if (!i->f->set_##field) \
307 return -EINVAL; \
308 val = simple_strtoul(buf, NULL, 0); \
309 i->f->set_##field(starget, val); \
310 return count; \
311 }
312
313 #define spi_transport_store_max(field, format_string) \
314 static ssize_t \
315 store_spi_transport_##field(struct device *dev, \
316 struct device_attribute *attr, \
317 const char *buf, size_t count) \
318 { \
319 int val; \
320 struct scsi_target *starget = transport_class_to_starget(dev); \
321 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
322 struct spi_internal *i = to_spi_internal(shost->transportt); \
323 struct spi_transport_attrs *tp \
324 = (struct spi_transport_attrs *)&starget->starget_data; \
325 \
326 if (i->f->set_##field) \
327 return -EINVAL; \
328 val = simple_strtoul(buf, NULL, 0); \
329 if (val > tp->max_##field) \
330 val = tp->max_##field; \
331 i->f->set_##field(starget, val); \
332 return count; \
333 }
334
335 #define spi_transport_rd_attr(field, format_string) \
336 spi_transport_show_function(field, format_string) \
337 spi_transport_store_function(field, format_string) \
338 static DEVICE_ATTR(field, S_IRUGO, \
339 show_spi_transport_##field, \
340 store_spi_transport_##field);
341
342 #define spi_transport_simple_attr(field, format_string) \
343 spi_transport_show_simple(field, format_string) \
344 spi_transport_store_simple(field, format_string) \
345 static DEVICE_ATTR(field, S_IRUGO, \
346 show_spi_transport_##field, \
347 store_spi_transport_##field);
348
349 #define spi_transport_max_attr(field, format_string) \
350 spi_transport_show_function(field, format_string) \
351 spi_transport_store_max(field, format_string) \
352 spi_transport_simple_attr(max_##field, format_string) \
353 static DEVICE_ATTR(field, S_IRUGO, \
354 show_spi_transport_##field, \
355 store_spi_transport_##field);
356
357 /* The Parallel SCSI Tranport Attributes: */
358 spi_transport_max_attr(offset, "%d\n");
359 spi_transport_max_attr(width, "%d\n");
360 spi_transport_rd_attr(iu, "%d\n");
361 spi_transport_rd_attr(dt, "%d\n");
362 spi_transport_rd_attr(qas, "%d\n");
363 spi_transport_rd_attr(wr_flow, "%d\n");
364 spi_transport_rd_attr(rd_strm, "%d\n");
365 spi_transport_rd_attr(rti, "%d\n");
366 spi_transport_rd_attr(pcomp_en, "%d\n");
367 spi_transport_rd_attr(hold_mcs, "%d\n");
368
369 /* we only care about the first child device so we return 1 */
370 static int child_iter(struct device *dev, void *data)
371 {
372 struct scsi_device *sdev = to_scsi_device(dev);
373
374 spi_dv_device(sdev);
375 return 1;
376 }
377
378 static ssize_t
379 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
380 const char *buf, size_t count)
381 {
382 struct scsi_target *starget = transport_class_to_starget(dev);
383
384 device_for_each_child(&starget->dev, NULL, child_iter);
385 return count;
386 }
387 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
388
389 /* Translate the period into ns according to the current spec
390 * for SDTR/PPR messages */
391 static int period_to_str(char *buf, int period)
392 {
393 int len, picosec;
394
395 if (period < 0 || period > 0xff) {
396 picosec = -1;
397 } else if (period <= SPI_STATIC_PPR) {
398 picosec = ppr_to_ps[period];
399 } else {
400 picosec = period * 4000;
401 }
402
403 if (picosec == -1) {
404 len = sprintf(buf, "reserved");
405 } else {
406 len = sprint_frac(buf, picosec, 1000);
407 }
408
409 return len;
410 }
411
412 static ssize_t
413 show_spi_transport_period_helper(char *buf, int period)
414 {
415 int len = period_to_str(buf, period);
416 buf[len++] = '\n';
417 buf[len] = '\0';
418 return len;
419 }
420
421 static ssize_t
422 store_spi_transport_period_helper(struct device *dev, const char *buf,
423 size_t count, int *periodp)
424 {
425 int j, picosec, period = -1;
426 char *endp;
427
428 picosec = simple_strtoul(buf, &endp, 10) * 1000;
429 if (*endp == '.') {
430 int mult = 100;
431 do {
432 endp++;
433 if (!isdigit(*endp))
434 break;
435 picosec += (*endp - '0') * mult;
436 mult /= 10;
437 } while (mult > 0);
438 }
439
440 for (j = 0; j <= SPI_STATIC_PPR; j++) {
441 if (ppr_to_ps[j] < picosec)
442 continue;
443 period = j;
444 break;
445 }
446
447 if (period == -1)
448 period = picosec / 4000;
449
450 if (period > 0xff)
451 period = 0xff;
452
453 *periodp = period;
454
455 return count;
456 }
457
458 static ssize_t
459 show_spi_transport_period(struct device *dev,
460 struct device_attribute *attr, char *buf)
461 {
462 struct scsi_target *starget = transport_class_to_starget(dev);
463 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
464 struct spi_internal *i = to_spi_internal(shost->transportt);
465 struct spi_transport_attrs *tp =
466 (struct spi_transport_attrs *)&starget->starget_data;
467
468 if (i->f->get_period)
469 i->f->get_period(starget);
470
471 return show_spi_transport_period_helper(buf, tp->period);
472 }
473
474 static ssize_t
475 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
476 const char *buf, size_t count)
477 {
478 struct scsi_target *starget = transport_class_to_starget(cdev);
479 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
480 struct spi_internal *i = to_spi_internal(shost->transportt);
481 struct spi_transport_attrs *tp =
482 (struct spi_transport_attrs *)&starget->starget_data;
483 int period, retval;
484
485 if (!i->f->set_period)
486 return -EINVAL;
487
488 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
489
490 if (period < tp->min_period)
491 period = tp->min_period;
492
493 i->f->set_period(starget, period);
494
495 return retval;
496 }
497
498 static DEVICE_ATTR(period, S_IRUGO,
499 show_spi_transport_period,
500 store_spi_transport_period);
501
502 static ssize_t
503 show_spi_transport_min_period(struct device *cdev,
504 struct device_attribute *attr, char *buf)
505 {
506 struct scsi_target *starget = transport_class_to_starget(cdev);
507 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
508 struct spi_internal *i = to_spi_internal(shost->transportt);
509 struct spi_transport_attrs *tp =
510 (struct spi_transport_attrs *)&starget->starget_data;
511
512 if (!i->f->set_period)
513 return -EINVAL;
514
515 return show_spi_transport_period_helper(buf, tp->min_period);
516 }
517
518 static ssize_t
519 store_spi_transport_min_period(struct device *cdev,
520 struct device_attribute *attr,
521 const char *buf, size_t count)
522 {
523 struct scsi_target *starget = transport_class_to_starget(cdev);
524 struct spi_transport_attrs *tp =
525 (struct spi_transport_attrs *)&starget->starget_data;
526
527 return store_spi_transport_period_helper(cdev, buf, count,
528 &tp->min_period);
529 }
530
531
532 static DEVICE_ATTR(min_period, S_IRUGO,
533 show_spi_transport_min_period,
534 store_spi_transport_min_period);
535
536
537 static ssize_t show_spi_host_signalling(struct device *cdev,
538 struct device_attribute *attr,
539 char *buf)
540 {
541 struct Scsi_Host *shost = transport_class_to_shost(cdev);
542 struct spi_internal *i = to_spi_internal(shost->transportt);
543
544 if (i->f->get_signalling)
545 i->f->get_signalling(shost);
546
547 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
548 }
549 static ssize_t store_spi_host_signalling(struct device *dev,
550 struct device_attribute *attr,
551 const char *buf, size_t count)
552 {
553 struct Scsi_Host *shost = transport_class_to_shost(dev);
554 struct spi_internal *i = to_spi_internal(shost->transportt);
555 enum spi_signal_type type = spi_signal_to_value(buf);
556
557 if (!i->f->set_signalling)
558 return -EINVAL;
559
560 if (type != SPI_SIGNAL_UNKNOWN)
561 i->f->set_signalling(shost, type);
562
563 return count;
564 }
565 static DEVICE_ATTR(signalling, S_IRUGO,
566 show_spi_host_signalling,
567 store_spi_host_signalling);
568
569 #define DV_SET(x, y) \
570 if(i->f->set_##x) \
571 i->f->set_##x(sdev->sdev_target, y)
572
573 enum spi_compare_returns {
574 SPI_COMPARE_SUCCESS,
575 SPI_COMPARE_FAILURE,
576 SPI_COMPARE_SKIP_TEST,
577 };
578
579
580 /* This is for read/write Domain Validation: If the device supports
581 * an echo buffer, we do read/write tests to it */
582 static enum spi_compare_returns
583 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
584 u8 *ptr, const int retries)
585 {
586 int len = ptr - buffer;
587 int j, k, r, result;
588 unsigned int pattern = 0x0000ffff;
589 struct scsi_sense_hdr sshdr;
590
591 const char spi_write_buffer[] = {
592 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
593 };
594 const char spi_read_buffer[] = {
595 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
596 };
597
598 /* set up the pattern buffer. Doesn't matter if we spill
599 * slightly beyond since that's where the read buffer is */
600 for (j = 0; j < len; ) {
601
602 /* fill the buffer with counting (test a) */
603 for ( ; j < min(len, 32); j++)
604 buffer[j] = j;
605 k = j;
606 /* fill the buffer with alternating words of 0x0 and
607 * 0xffff (test b) */
608 for ( ; j < min(len, k + 32); j += 2) {
609 u16 *word = (u16 *)&buffer[j];
610
611 *word = (j & 0x02) ? 0x0000 : 0xffff;
612 }
613 k = j;
614 /* fill with crosstalk (alternating 0x5555 0xaaa)
615 * (test c) */
616 for ( ; j < min(len, k + 32); j += 2) {
617 u16 *word = (u16 *)&buffer[j];
618
619 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
620 }
621 k = j;
622 /* fill with shifting bits (test d) */
623 for ( ; j < min(len, k + 32); j += 4) {
624 u32 *word = (unsigned int *)&buffer[j];
625 u32 roll = (pattern & 0x80000000) ? 1 : 0;
626
627 *word = pattern;
628 pattern = (pattern << 1) | roll;
629 }
630 /* don't bother with random data (test e) */
631 }
632
633 for (r = 0; r < retries; r++) {
634 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
635 buffer, len, &sshdr);
636 if(result || !scsi_device_online(sdev)) {
637
638 scsi_device_set_state(sdev, SDEV_QUIESCE);
639 if (scsi_sense_valid(&sshdr)
640 && sshdr.sense_key == ILLEGAL_REQUEST
641 /* INVALID FIELD IN CDB */
642 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
643 /* This would mean that the drive lied
644 * to us about supporting an echo
645 * buffer (unfortunately some Western
646 * Digital drives do precisely this)
647 */
648 return SPI_COMPARE_SKIP_TEST;
649
650
651 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
652 return SPI_COMPARE_FAILURE;
653 }
654
655 memset(ptr, 0, len);
656 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
657 ptr, len, NULL);
658 scsi_device_set_state(sdev, SDEV_QUIESCE);
659
660 if (memcmp(buffer, ptr, len) != 0)
661 return SPI_COMPARE_FAILURE;
662 }
663 return SPI_COMPARE_SUCCESS;
664 }
665
666 /* This is for the simplest form of Domain Validation: a read test
667 * on the inquiry data from the device */
668 static enum spi_compare_returns
669 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
670 u8 *ptr, const int retries)
671 {
672 int r, result;
673 const int len = sdev->inquiry_len;
674 const char spi_inquiry[] = {
675 INQUIRY, 0, 0, 0, len, 0
676 };
677
678 for (r = 0; r < retries; r++) {
679 memset(ptr, 0, len);
680
681 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
682 ptr, len, NULL);
683
684 if(result || !scsi_device_online(sdev)) {
685 scsi_device_set_state(sdev, SDEV_QUIESCE);
686 return SPI_COMPARE_FAILURE;
687 }
688
689 /* If we don't have the inquiry data already, the
690 * first read gets it */
691 if (ptr == buffer) {
692 ptr += len;
693 --r;
694 continue;
695 }
696
697 if (memcmp(buffer, ptr, len) != 0)
698 /* failure */
699 return SPI_COMPARE_FAILURE;
700 }
701 return SPI_COMPARE_SUCCESS;
702 }
703
704 static enum spi_compare_returns
705 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
706 enum spi_compare_returns
707 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
708 {
709 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
710 struct scsi_target *starget = sdev->sdev_target;
711 int period = 0, prevperiod = 0;
712 enum spi_compare_returns retval;
713
714
715 for (;;) {
716 int newperiod;
717 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
718
719 if (retval == SPI_COMPARE_SUCCESS
720 || retval == SPI_COMPARE_SKIP_TEST)
721 break;
722
723 /* OK, retrain, fallback */
724 if (i->f->get_iu)
725 i->f->get_iu(starget);
726 if (i->f->get_qas)
727 i->f->get_qas(starget);
728 if (i->f->get_period)
729 i->f->get_period(sdev->sdev_target);
730
731 /* Here's the fallback sequence; first try turning off
732 * IU, then QAS (if we can control them), then finally
733 * fall down the periods */
734 if (i->f->set_iu && spi_iu(starget)) {
735 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
736 DV_SET(iu, 0);
737 } else if (i->f->set_qas && spi_qas(starget)) {
738 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
739 DV_SET(qas, 0);
740 } else {
741 newperiod = spi_period(starget);
742 period = newperiod > period ? newperiod : period;
743 if (period < 0x0d)
744 period++;
745 else
746 period += period >> 1;
747
748 if (unlikely(period > 0xff || period == prevperiod)) {
749 /* Total failure; set to async and return */
750 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
751 DV_SET(offset, 0);
752 return SPI_COMPARE_FAILURE;
753 }
754 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
755 DV_SET(period, period);
756 prevperiod = period;
757 }
758 }
759 return retval;
760 }
761
762 static int
763 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
764 {
765 int l, result;
766
767 /* first off do a test unit ready. This can error out
768 * because of reservations or some other reason. If it
769 * fails, the device won't let us write to the echo buffer
770 * so just return failure */
771
772 const char spi_test_unit_ready[] = {
773 TEST_UNIT_READY, 0, 0, 0, 0, 0
774 };
775
776 const char spi_read_buffer_descriptor[] = {
777 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
778 };
779
780
781 /* We send a set of three TURs to clear any outstanding
782 * unit attention conditions if they exist (Otherwise the
783 * buffer tests won't be happy). If the TUR still fails
784 * (reservation conflict, device not ready, etc) just
785 * skip the write tests */
786 for (l = 0; ; l++) {
787 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
788 NULL, 0, NULL);
789
790 if(result) {
791 if(l >= 3)
792 return 0;
793 } else {
794 /* TUR succeeded */
795 break;
796 }
797 }
798
799 result = spi_execute(sdev, spi_read_buffer_descriptor,
800 DMA_FROM_DEVICE, buffer, 4, NULL);
801
802 if (result)
803 /* Device has no echo buffer */
804 return 0;
805
806 return buffer[3] + ((buffer[2] & 0x1f) << 8);
807 }
808
809 static void
810 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
811 {
812 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
813 struct scsi_target *starget = sdev->sdev_target;
814 struct Scsi_Host *shost = sdev->host;
815 int len = sdev->inquiry_len;
816 int min_period = spi_min_period(starget);
817 int max_width = spi_max_width(starget);
818 /* first set us up for narrow async */
819 DV_SET(offset, 0);
820 DV_SET(width, 0);
821
822 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
823 != SPI_COMPARE_SUCCESS) {
824 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
825 /* FIXME: should probably offline the device here? */
826 return;
827 }
828
829 if (!scsi_device_wide(sdev)) {
830 spi_max_width(starget) = 0;
831 max_width = 0;
832 }
833
834 /* test width */
835 if (i->f->set_width && max_width) {
836 i->f->set_width(starget, 1);
837
838 if (spi_dv_device_compare_inquiry(sdev, buffer,
839 buffer + len,
840 DV_LOOPS)
841 != SPI_COMPARE_SUCCESS) {
842 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
843 i->f->set_width(starget, 0);
844 /* Make sure we don't force wide back on by asking
845 * for a transfer period that requires it */
846 max_width = 0;
847 if (min_period < 10)
848 min_period = 10;
849 }
850 }
851
852 if (!i->f->set_period)
853 return;
854
855 /* device can't handle synchronous */
856 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
857 return;
858
859 /* len == -1 is the signal that we need to ascertain the
860 * presence of an echo buffer before trying to use it. len ==
861 * 0 means we don't have an echo buffer */
862 len = -1;
863
864 retry:
865
866 /* now set up to the maximum */
867 DV_SET(offset, spi_max_offset(starget));
868 DV_SET(period, min_period);
869
870 /* try QAS requests; this should be harmless to set if the
871 * target supports it */
872 if (scsi_device_qas(sdev)) {
873 DV_SET(qas, 1);
874 } else {
875 DV_SET(qas, 0);
876 }
877
878 if (scsi_device_ius(sdev) && min_period < 9) {
879 /* This u320 (or u640). Set IU transfers */
880 DV_SET(iu, 1);
881 /* Then set the optional parameters */
882 DV_SET(rd_strm, 1);
883 DV_SET(wr_flow, 1);
884 DV_SET(rti, 1);
885 if (min_period == 8)
886 DV_SET(pcomp_en, 1);
887 } else {
888 DV_SET(iu, 0);
889 }
890
891 /* now that we've done all this, actually check the bus
892 * signal type (if known). Some devices are stupid on
893 * a SE bus and still claim they can try LVD only settings */
894 if (i->f->get_signalling)
895 i->f->get_signalling(shost);
896 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
897 spi_signalling(shost) == SPI_SIGNAL_HVD ||
898 !scsi_device_dt(sdev)) {
899 DV_SET(dt, 0);
900 } else {
901 DV_SET(dt, 1);
902 }
903 /* set width last because it will pull all the other
904 * parameters down to required values */
905 DV_SET(width, max_width);
906
907 /* Do the read only INQUIRY tests */
908 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
909 spi_dv_device_compare_inquiry);
910 /* See if we actually managed to negotiate and sustain DT */
911 if (i->f->get_dt)
912 i->f->get_dt(starget);
913
914 /* see if the device has an echo buffer. If it does we can do
915 * the SPI pattern write tests. Because of some broken
916 * devices, we *only* try this on a device that has actually
917 * negotiated DT */
918
919 if (len == -1 && spi_dt(starget))
920 len = spi_dv_device_get_echo_buffer(sdev, buffer);
921
922 if (len <= 0) {
923 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
924 return;
925 }
926
927 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
928 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
929 len = SPI_MAX_ECHO_BUFFER_SIZE;
930 }
931
932 if (spi_dv_retrain(sdev, buffer, buffer + len,
933 spi_dv_device_echo_buffer)
934 == SPI_COMPARE_SKIP_TEST) {
935 /* OK, the stupid drive can't do a write echo buffer
936 * test after all, fall back to the read tests */
937 len = 0;
938 goto retry;
939 }
940 }
941
942
943 /** spi_dv_device - Do Domain Validation on the device
944 * @sdev: scsi device to validate
945 *
946 * Performs the domain validation on the given device in the
947 * current execution thread. Since DV operations may sleep,
948 * the current thread must have user context. Also no SCSI
949 * related locks that would deadlock I/O issued by the DV may
950 * be held.
951 */
952 void
953 spi_dv_device(struct scsi_device *sdev)
954 {
955 struct scsi_target *starget = sdev->sdev_target;
956 u8 *buffer;
957 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
958
959 if (unlikely(scsi_device_get(sdev)))
960 return;
961
962 if (unlikely(spi_dv_in_progress(starget)))
963 return;
964 spi_dv_in_progress(starget) = 1;
965
966 buffer = kzalloc(len, GFP_KERNEL);
967
968 if (unlikely(!buffer))
969 goto out_put;
970
971 /* We need to verify that the actual device will quiesce; the
972 * later target quiesce is just a nice to have */
973 if (unlikely(scsi_device_quiesce(sdev)))
974 goto out_free;
975
976 scsi_target_quiesce(starget);
977
978 spi_dv_pending(starget) = 1;
979 mutex_lock(&spi_dv_mutex(starget));
980
981 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
982
983 spi_dv_device_internal(sdev, buffer);
984
985 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
986
987 mutex_unlock(&spi_dv_mutex(starget));
988 spi_dv_pending(starget) = 0;
989
990 scsi_target_resume(starget);
991
992 spi_initial_dv(starget) = 1;
993
994 out_free:
995 kfree(buffer);
996 out_put:
997 spi_dv_in_progress(starget) = 0;
998 scsi_device_put(sdev);
999 }
1000 EXPORT_SYMBOL(spi_dv_device);
1001
1002 struct work_queue_wrapper {
1003 struct work_struct work;
1004 struct scsi_device *sdev;
1005 };
1006
1007 static void
1008 spi_dv_device_work_wrapper(struct work_struct *work)
1009 {
1010 struct work_queue_wrapper *wqw =
1011 container_of(work, struct work_queue_wrapper, work);
1012 struct scsi_device *sdev = wqw->sdev;
1013
1014 kfree(wqw);
1015 spi_dv_device(sdev);
1016 spi_dv_pending(sdev->sdev_target) = 0;
1017 scsi_device_put(sdev);
1018 }
1019
1020
1021 /**
1022 * spi_schedule_dv_device - schedule domain validation to occur on the device
1023 * @sdev: The device to validate
1024 *
1025 * Identical to spi_dv_device() above, except that the DV will be
1026 * scheduled to occur in a workqueue later. All memory allocations
1027 * are atomic, so may be called from any context including those holding
1028 * SCSI locks.
1029 */
1030 void
1031 spi_schedule_dv_device(struct scsi_device *sdev)
1032 {
1033 struct work_queue_wrapper *wqw =
1034 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1035
1036 if (unlikely(!wqw))
1037 return;
1038
1039 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1040 kfree(wqw);
1041 return;
1042 }
1043 /* Set pending early (dv_device doesn't check it, only sets it) */
1044 spi_dv_pending(sdev->sdev_target) = 1;
1045 if (unlikely(scsi_device_get(sdev))) {
1046 kfree(wqw);
1047 spi_dv_pending(sdev->sdev_target) = 0;
1048 return;
1049 }
1050
1051 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1052 wqw->sdev = sdev;
1053
1054 schedule_work(&wqw->work);
1055 }
1056 EXPORT_SYMBOL(spi_schedule_dv_device);
1057
1058 /**
1059 * spi_display_xfer_agreement - Print the current target transfer agreement
1060 * @starget: The target for which to display the agreement
1061 *
1062 * Each SPI port is required to maintain a transfer agreement for each
1063 * other port on the bus. This function prints a one-line summary of
1064 * the current agreement; more detailed information is available in sysfs.
1065 */
1066 void spi_display_xfer_agreement(struct scsi_target *starget)
1067 {
1068 struct spi_transport_attrs *tp;
1069 tp = (struct spi_transport_attrs *)&starget->starget_data;
1070
1071 if (tp->offset > 0 && tp->period > 0) {
1072 unsigned int picosec, kb100;
1073 char *scsi = "FAST-?";
1074 char tmp[8];
1075
1076 if (tp->period <= SPI_STATIC_PPR) {
1077 picosec = ppr_to_ps[tp->period];
1078 switch (tp->period) {
1079 case 7: scsi = "FAST-320"; break;
1080 case 8: scsi = "FAST-160"; break;
1081 case 9: scsi = "FAST-80"; break;
1082 case 10:
1083 case 11: scsi = "FAST-40"; break;
1084 case 12: scsi = "FAST-20"; break;
1085 }
1086 } else {
1087 picosec = tp->period * 4000;
1088 if (tp->period < 25)
1089 scsi = "FAST-20";
1090 else if (tp->period < 50)
1091 scsi = "FAST-10";
1092 else
1093 scsi = "FAST-5";
1094 }
1095
1096 kb100 = (10000000 + picosec / 2) / picosec;
1097 if (tp->width)
1098 kb100 *= 2;
1099 sprint_frac(tmp, picosec, 1000);
1100
1101 dev_info(&starget->dev,
1102 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1103 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1104 tp->dt ? "DT" : "ST",
1105 tp->iu ? " IU" : "",
1106 tp->qas ? " QAS" : "",
1107 tp->rd_strm ? " RDSTRM" : "",
1108 tp->rti ? " RTI" : "",
1109 tp->wr_flow ? " WRFLOW" : "",
1110 tp->pcomp_en ? " PCOMP" : "",
1111 tp->hold_mcs ? " HMCS" : "",
1112 tmp, tp->offset);
1113 } else {
1114 dev_info(&starget->dev, "%sasynchronous\n",
1115 tp->width ? "wide " : "");
1116 }
1117 }
1118 EXPORT_SYMBOL(spi_display_xfer_agreement);
1119
1120 int spi_populate_width_msg(unsigned char *msg, int width)
1121 {
1122 msg[0] = EXTENDED_MESSAGE;
1123 msg[1] = 2;
1124 msg[2] = EXTENDED_WDTR;
1125 msg[3] = width;
1126 return 4;
1127 }
1128 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1129
1130 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1131 {
1132 msg[0] = EXTENDED_MESSAGE;
1133 msg[1] = 3;
1134 msg[2] = EXTENDED_SDTR;
1135 msg[3] = period;
1136 msg[4] = offset;
1137 return 5;
1138 }
1139 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1140
1141 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1142 int width, int options)
1143 {
1144 msg[0] = EXTENDED_MESSAGE;
1145 msg[1] = 6;
1146 msg[2] = EXTENDED_PPR;
1147 msg[3] = period;
1148 msg[4] = 0;
1149 msg[5] = offset;
1150 msg[6] = width;
1151 msg[7] = options;
1152 return 8;
1153 }
1154 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1155
1156 #ifdef CONFIG_SCSI_CONSTANTS
1157 static const char * const one_byte_msgs[] = {
1158 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1159 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1160 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1161 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1162 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1163 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1164 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1165 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1166 };
1167
1168 static const char * const two_byte_msgs[] = {
1169 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1170 /* 0x23 */ "Ignore Wide Residue", "ACA"
1171 };
1172
1173 static const char * const extended_msgs[] = {
1174 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1175 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1176 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1177 };
1178
1179 static void print_nego(const unsigned char *msg, int per, int off, int width)
1180 {
1181 if (per) {
1182 char buf[20];
1183 period_to_str(buf, msg[per]);
1184 printk("period = %s ns ", buf);
1185 }
1186
1187 if (off)
1188 printk("offset = %d ", msg[off]);
1189 if (width)
1190 printk("width = %d ", 8 << msg[width]);
1191 }
1192
1193 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1194 {
1195 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1196 msg[msb+3];
1197 printk("%s = %d ", desc, ptr);
1198 }
1199
1200 int spi_print_msg(const unsigned char *msg)
1201 {
1202 int len = 1, i;
1203 if (msg[0] == EXTENDED_MESSAGE) {
1204 len = 2 + msg[1];
1205 if (len == 2)
1206 len += 256;
1207 if (msg[2] < ARRAY_SIZE(extended_msgs))
1208 printk ("%s ", extended_msgs[msg[2]]);
1209 else
1210 printk ("Extended Message, reserved code (0x%02x) ",
1211 (int) msg[2]);
1212 switch (msg[2]) {
1213 case EXTENDED_MODIFY_DATA_POINTER:
1214 print_ptr(msg, 3, "pointer");
1215 break;
1216 case EXTENDED_SDTR:
1217 print_nego(msg, 3, 4, 0);
1218 break;
1219 case EXTENDED_WDTR:
1220 print_nego(msg, 0, 0, 3);
1221 break;
1222 case EXTENDED_PPR:
1223 print_nego(msg, 3, 5, 6);
1224 break;
1225 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1226 print_ptr(msg, 3, "out");
1227 print_ptr(msg, 7, "in");
1228 break;
1229 default:
1230 for (i = 2; i < len; ++i)
1231 printk("%02x ", msg[i]);
1232 }
1233 /* Identify */
1234 } else if (msg[0] & 0x80) {
1235 printk("Identify disconnect %sallowed %s %d ",
1236 (msg[0] & 0x40) ? "" : "not ",
1237 (msg[0] & 0x20) ? "target routine" : "lun",
1238 msg[0] & 0x7);
1239 /* Normal One byte */
1240 } else if (msg[0] < 0x1f) {
1241 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1242 printk("%s ", one_byte_msgs[msg[0]]);
1243 else
1244 printk("reserved (%02x) ", msg[0]);
1245 } else if (msg[0] == 0x55) {
1246 printk("QAS Request ");
1247 /* Two byte */
1248 } else if (msg[0] <= 0x2f) {
1249 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1250 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1251 msg[1]);
1252 else
1253 printk("reserved two byte (%02x %02x) ",
1254 msg[0], msg[1]);
1255 len = 2;
1256 } else
1257 printk("reserved ");
1258 return len;
1259 }
1260 EXPORT_SYMBOL(spi_print_msg);
1261
1262 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1263
1264 int spi_print_msg(const unsigned char *msg)
1265 {
1266 int len = 1, i;
1267
1268 if (msg[0] == EXTENDED_MESSAGE) {
1269 len = 2 + msg[1];
1270 if (len == 2)
1271 len += 256;
1272 for (i = 0; i < len; ++i)
1273 printk("%02x ", msg[i]);
1274 /* Identify */
1275 } else if (msg[0] & 0x80) {
1276 printk("%02x ", msg[0]);
1277 /* Normal One byte */
1278 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1279 printk("%02x ", msg[0]);
1280 /* Two byte */
1281 } else if (msg[0] <= 0x2f) {
1282 printk("%02x %02x", msg[0], msg[1]);
1283 len = 2;
1284 } else
1285 printk("%02x ", msg[0]);
1286 return len;
1287 }
1288 EXPORT_SYMBOL(spi_print_msg);
1289 #endif /* ! CONFIG_SCSI_CONSTANTS */
1290
1291 static int spi_device_match(struct attribute_container *cont,
1292 struct device *dev)
1293 {
1294 struct scsi_device *sdev;
1295 struct Scsi_Host *shost;
1296 struct spi_internal *i;
1297
1298 if (!scsi_is_sdev_device(dev))
1299 return 0;
1300
1301 sdev = to_scsi_device(dev);
1302 shost = sdev->host;
1303 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1304 != &spi_host_class.class)
1305 return 0;
1306 /* Note: this class has no device attributes, so it has
1307 * no per-HBA allocation and thus we don't need to distinguish
1308 * the attribute containers for the device */
1309 i = to_spi_internal(shost->transportt);
1310 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1311 return 0;
1312 return 1;
1313 }
1314
1315 static int spi_target_match(struct attribute_container *cont,
1316 struct device *dev)
1317 {
1318 struct Scsi_Host *shost;
1319 struct scsi_target *starget;
1320 struct spi_internal *i;
1321
1322 if (!scsi_is_target_device(dev))
1323 return 0;
1324
1325 shost = dev_to_shost(dev->parent);
1326 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1327 != &spi_host_class.class)
1328 return 0;
1329
1330 i = to_spi_internal(shost->transportt);
1331 starget = to_scsi_target(dev);
1332
1333 if (i->f->deny_binding && i->f->deny_binding(starget))
1334 return 0;
1335
1336 return &i->t.target_attrs.ac == cont;
1337 }
1338
1339 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1340 "spi_transport",
1341 spi_setup_transport_attrs,
1342 NULL,
1343 spi_target_configure);
1344
1345 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1346 spi_device_match,
1347 spi_device_configure);
1348
1349 static struct attribute *host_attributes[] = {
1350 &dev_attr_signalling.attr,
1351 NULL
1352 };
1353
1354 static struct attribute_group host_attribute_group = {
1355 .attrs = host_attributes,
1356 };
1357
1358 static int spi_host_configure(struct transport_container *tc,
1359 struct device *dev,
1360 struct device *cdev)
1361 {
1362 struct kobject *kobj = &cdev->kobj;
1363 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1364 struct spi_internal *si = to_spi_internal(shost->transportt);
1365 struct attribute *attr = &dev_attr_signalling.attr;
1366 int rc = 0;
1367
1368 if (si->f->set_signalling)
1369 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1370
1371 return rc;
1372 }
1373
1374 /* returns true if we should be showing the variable. Also
1375 * overloads the return by setting 1<<1 if the attribute should
1376 * be writeable */
1377 #define TARGET_ATTRIBUTE_HELPER(name) \
1378 (si->f->show_##name ? S_IRUGO : 0) | \
1379 (si->f->set_##name ? S_IWUSR : 0)
1380
1381 static mode_t target_attribute_is_visible(struct kobject *kobj,
1382 struct attribute *attr, int i)
1383 {
1384 struct device *cdev = container_of(kobj, struct device, kobj);
1385 struct scsi_target *starget = transport_class_to_starget(cdev);
1386 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1387 struct spi_internal *si = to_spi_internal(shost->transportt);
1388
1389 if (attr == &dev_attr_period.attr &&
1390 spi_support_sync(starget))
1391 return TARGET_ATTRIBUTE_HELPER(period);
1392 else if (attr == &dev_attr_min_period.attr &&
1393 spi_support_sync(starget))
1394 return TARGET_ATTRIBUTE_HELPER(period);
1395 else if (attr == &dev_attr_offset.attr &&
1396 spi_support_sync(starget))
1397 return TARGET_ATTRIBUTE_HELPER(offset);
1398 else if (attr == &dev_attr_max_offset.attr &&
1399 spi_support_sync(starget))
1400 return TARGET_ATTRIBUTE_HELPER(offset);
1401 else if (attr == &dev_attr_width.attr &&
1402 spi_support_wide(starget))
1403 return TARGET_ATTRIBUTE_HELPER(width);
1404 else if (attr == &dev_attr_max_width.attr &&
1405 spi_support_wide(starget))
1406 return TARGET_ATTRIBUTE_HELPER(width);
1407 else if (attr == &dev_attr_iu.attr &&
1408 spi_support_ius(starget))
1409 return TARGET_ATTRIBUTE_HELPER(iu);
1410 else if (attr == &dev_attr_dt.attr &&
1411 spi_support_dt(starget))
1412 return TARGET_ATTRIBUTE_HELPER(dt);
1413 else if (attr == &dev_attr_qas.attr &&
1414 spi_support_qas(starget))
1415 return TARGET_ATTRIBUTE_HELPER(qas);
1416 else if (attr == &dev_attr_wr_flow.attr &&
1417 spi_support_ius(starget))
1418 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1419 else if (attr == &dev_attr_rd_strm.attr &&
1420 spi_support_ius(starget))
1421 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1422 else if (attr == &dev_attr_rti.attr &&
1423 spi_support_ius(starget))
1424 return TARGET_ATTRIBUTE_HELPER(rti);
1425 else if (attr == &dev_attr_pcomp_en.attr &&
1426 spi_support_ius(starget))
1427 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1428 else if (attr == &dev_attr_hold_mcs.attr &&
1429 spi_support_ius(starget))
1430 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1431 else if (attr == &dev_attr_revalidate.attr)
1432 return S_IWUSR;
1433
1434 return 0;
1435 }
1436
1437 static struct attribute *target_attributes[] = {
1438 &dev_attr_period.attr,
1439 &dev_attr_min_period.attr,
1440 &dev_attr_offset.attr,
1441 &dev_attr_max_offset.attr,
1442 &dev_attr_width.attr,
1443 &dev_attr_max_width.attr,
1444 &dev_attr_iu.attr,
1445 &dev_attr_dt.attr,
1446 &dev_attr_qas.attr,
1447 &dev_attr_wr_flow.attr,
1448 &dev_attr_rd_strm.attr,
1449 &dev_attr_rti.attr,
1450 &dev_attr_pcomp_en.attr,
1451 &dev_attr_hold_mcs.attr,
1452 &dev_attr_revalidate.attr,
1453 NULL
1454 };
1455
1456 static struct attribute_group target_attribute_group = {
1457 .attrs = target_attributes,
1458 .is_visible = target_attribute_is_visible,
1459 };
1460
1461 static int spi_target_configure(struct transport_container *tc,
1462 struct device *dev,
1463 struct device *cdev)
1464 {
1465 struct kobject *kobj = &cdev->kobj;
1466
1467 /* force an update based on parameters read from the device */
1468 sysfs_update_group(kobj, &target_attribute_group);
1469
1470 return 0;
1471 }
1472
1473 struct scsi_transport_template *
1474 spi_attach_transport(struct spi_function_template *ft)
1475 {
1476 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1477 GFP_KERNEL);
1478
1479 if (unlikely(!i))
1480 return NULL;
1481
1482 i->t.target_attrs.ac.class = &spi_transport_class.class;
1483 i->t.target_attrs.ac.grp = &target_attribute_group;
1484 i->t.target_attrs.ac.match = spi_target_match;
1485 transport_container_register(&i->t.target_attrs);
1486 i->t.target_size = sizeof(struct spi_transport_attrs);
1487 i->t.host_attrs.ac.class = &spi_host_class.class;
1488 i->t.host_attrs.ac.grp = &host_attribute_group;
1489 i->t.host_attrs.ac.match = spi_host_match;
1490 transport_container_register(&i->t.host_attrs);
1491 i->t.host_size = sizeof(struct spi_host_attrs);
1492 i->f = ft;
1493
1494 return &i->t;
1495 }
1496 EXPORT_SYMBOL(spi_attach_transport);
1497
1498 void spi_release_transport(struct scsi_transport_template *t)
1499 {
1500 struct spi_internal *i = to_spi_internal(t);
1501
1502 transport_container_unregister(&i->t.target_attrs);
1503 transport_container_unregister(&i->t.host_attrs);
1504
1505 kfree(i);
1506 }
1507 EXPORT_SYMBOL(spi_release_transport);
1508
1509 static __init int spi_transport_init(void)
1510 {
1511 int error = transport_class_register(&spi_transport_class);
1512 if (error)
1513 return error;
1514 error = anon_transport_class_register(&spi_device_class);
1515 return transport_class_register(&spi_host_class);
1516 }
1517
1518 static void __exit spi_transport_exit(void)
1519 {
1520 transport_class_unregister(&spi_transport_class);
1521 anon_transport_class_unregister(&spi_device_class);
1522 transport_class_unregister(&spi_host_class);
1523 }
1524
1525 MODULE_AUTHOR("Martin Hicks");
1526 MODULE_DESCRIPTION("SPI Transport Attributes");
1527 MODULE_LICENSE("GPL");
1528
1529 module_init(spi_transport_init);
1530 module_exit(spi_transport_exit);
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